| お | と | う | と | 
|---|---|---|---|
| 弟 | 
noun
- younger brother, little brother, kid brother.
 - brother-in-law (spouse's younger brother or younger sister's husband).
 - pupil, apprentice. Archaism.
 
Variations
| Pronunciation | Kanji | Kana | Is Common | |||||
|---|---|---|---|---|---|---|---|---|
                                
  | 
                            弟 | おとうと | ✔ | |||||
                                
  | 
                            弟 | てい |